Portion of a shoe midsole



FIG. 1 is a front perspective view of a portion of a shoe midsole showing my new design;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a side view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. The two different stippling densities represent contrasting appearances and no specific colors, materials, or finishes are hereby claimed. 

The ornamental design for a portion of a shoe midsole, as shown and described. 